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Step * 1 of Lemma before-reverse


1. [T] : Type
⊢ ∀x,y:T.  (x before y ∈ [] ⇐⇒ y before x ∈ [])
BY
{ ((Auto THEN FLemma `nil_before` [-1]) THEN Auto) }

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Latex:

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Latex:

1.  [T]  :  Type
\mvdash{}  \mforall{}x,y:T.    (x  before  y  \mmember{}  []  \mLeftarrow{}{}\mRightarrow{}  y  before  x  \mmember{}  [])


By

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Latex:
((Auto  THEN  FLemma  `nil\_before`  [-1])  THEN  Auto)

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